- 您现在的位置：买卖IC网 > PDF目录16777 > MAX17014ETM+ (Maxim Integrated Products)IC PWR SUPPLY MULT-OUTPUT 48TQFN PDF资料下载
参数资料
| 型号： | MAX17014ETM+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/33页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY MULT-OUTPUT 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 43 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 8 V ~ 16.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（7x7） |
| 包装： | 托盘 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页当前第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
Low-Cost Multiple-Output
Power Supply for LCD TVs
Driving Pure Capacitive Load
The operational amplifiers are typically used to drive
the LCD backplane (VCOM) or the gamma-correction
divider string. The LCD backplane consists of a distrib-
uted series capacitance and resistance, a load that can
be easily driven by the operational amplifier. However,
if the operational amplifier is used in an application with
a pure capacitive load, steps must be taken to ensure
stable operation. As the operational amplifier’s capaci-
tive load increases, the amplifier’s bandwidth decreas-
es and gain peaking increases. A 5 Ω to 50 Ω small
resistor placed between OUT_ and the capacitive load
reduces peaking, but also reduces the gain. An alter-
native method of reducing peaking is to place a series
RC network (snubber) in parallel with the capacitive
load. The RC network does not continuously load the
output or reduce the gain. Typical values of the resistor
are between 100 Ω and 200 Ω , and the typical value of
the capacitor is 10nF.
Linear Regulator (VL)
The MAX17014 includes an internal linear regulator. V IN
is the input of the linear regulator. The input voltage
range is between 8V and 16.5V. The output voltage is set
to 5V. The regulator powers the internal MOSFET drivers,
PWM controllers, charge-pump regulators, and logic cir-
cuitry. The total external load capability is 25mA. Bypass
VL to GND with a minimum 1μF ceramic capacitor.
Reference Voltage (REF)
The reference output is nominally 1.25V, and can
source at least 50μA (see the Typical Operating
Characteristics). VL is the input of the internal reference
block. Bypass REF with a 0.22μF ceramic capacitor
connected between REF and GND.
Frequency Selection (FSEL)
The step-down regulator and step-up regulator use the
same internal oscillator. The FSEL input selects the
switching frequency. Table 3 shows the switching fre-
quency based on the FSEL connection. High-frequency
(1.2MHz) operation optimizes the application for the
smallest component size, trading off efficiency due to
higher switching losses. Low-frequency (600kHz) oper-
ation offers the best overall efficiency at the expense of
component size and board space.
Table 3. Frequency Selection
Power-Up Sequence
The step-down regulator starts up when the MAX17014’s
internal reference voltage (REF) is above its undervolt-
age lockout (UVLO) threshold and EN1 is logic-high.
Once the step-down regulator reaches regulation, the
FB2 fault-detection circuit and the negative charge-
pump delay block are enabled. An 8μA current source
at DEL1 charges C DEL1 linearly. The negative charge-
pump regulator soft-starts when V DEL1 reaches V REF .
FBN fault detection is enabled once the negative
charge-pump soft-start is done.
The step-up regulator, p-channel MOSFET pass switch,
and positive charge-pump startup sequence begin
when the step-down regulator reaches regulation and
EN2 is logic-high. An 8μA current source at DEL2
charges C DEL2 linearly and the p-channel MOSFET
pass switch is enabled when V DEL2 reaches V REF . A
30μA current source pulls down on SUI, slowly turning
on the p-channel MOSFET switch between SWI and
SWO. The step-up regulator, positive charge pump,
and the delay block for the high-voltage switch starts
when the SWI to SUI voltage difference (V SWI - V SUI )
reaches the SUI-done threshold (5V, typ). An 8μA cur-
rent source charges C DLP linearly and when V DLP
reaches V REF, the high-voltage switch is enabled and
GON can be controlled by CTL.
The FB1 fault-detection circuit is enabled after the step-
up regulator reaches regulation, and similarly the FBP
fault-detection circuit is enabled after the positive charge
pump reaches regulation. For nondelayed startups,
capacitors can be omitted from DEL1, DEL2, and DLP.
When their current sources pull the unconnected pins
above their thresholds, the associated outputs start.
Power-Down Control
The MAX17014 disables the step-up regulator, positive-
charge-pump regulator input switch control block,
delay block, and high-voltage switch control block
when EN2 is logic-low, or when the fault latch is set.
The step-down regulator and negative charge-pump
regulator are disabled only when EN1 is logic-low or
when the fault latch is set.
FSEL
V IN
GND
SWITCHING FREQUENCY (kHz)
1200
600
24
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| B78108S1275J | CHOKE RF 2700UH 75MA AXIAL |
| RBM11DRKF | CONN EDGECARD 22POS DIP .156 SLD |
| GMM08DSAN | CONN EDGECARD 16POS R/A .156 SLD |
| GSM08DSAH | CONN EDGECARD 16POS R/A .156 SLD |
| 0150150833 | CABLE FLAT FLEX 33POS .3MM 8" |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17014ETM+ | 功能描述:其他电源管理 Power Supply for LCD TVs RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| MAX17014ETM+T | 功能描述:显示驱动器和控制器 Power Supply for LCD TVs RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17014EVKIT+ | 功能描述:电源管理IC开发工具 MAX17014 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17015AETP+ | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17015AETP+T | 功能描述:电池管理 1.2MHz High-Perf Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。